Ore-concentrating device



eph 2, 1928.

M. M. NEWTON ORE CONCENTRATING DEVICE Filed July 1, 1927 2 Sheets-Sheet 1 M. M. NETON ORE CONCENTRATING DEVICE Fild July 1, 192'? Patented Sept 25, lhfidi v IlllllERlLE lllE NJEW'ION, OF GRAGMOB, OOLQRADU.

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a plication filed. m 1, 1927. sen-a1 now aoaaaa.

This invention relates to improvements in the'constructiono'f oreconcentra ting devices. It is the object of this invention to pro duce a concentrating table that shall have it a large capacity and which shall produce exceptionably good results.

lt is another object of this invention to produce a concentrating device that shall overcome the objection of flotation. One of the most objectionable -Features in connection with ore concentration is that a large proportion or the values are lost lOQCiITISi-l they float on the Water. The mineral known as sylvanite is valuable but is usually pres out in such finely divided state that it will not overcome the surface tension of water but will float on the surface film and get lost. his lon asthe sylvanite is kept under the surface of the Water it will not float, but if it ever gets exposed to the air and then subjected to the action of Water whose surface rises from below, it will be carried away by the water as it is so finely divided that it will not break through the surface film on the water. If care is taken that the sylvanite is kept covered by a layer of water it can be concentrated like larger particles. It is an object of this invention, therefore, to produce machine of such a design that the mineral values will be kept submerged during the concentration operation for the purpose of preventing the escape (it the sylvanite and flour gold.

Another object of this invention is to produce a machine that will have a large 'apacity and which for this purpose is there- TEOIO so constructed that it will auton'iatically separate and discharge the lighter particles over the sides of the table and thereby relieve it from this excessive mass of coarse and worthless gangue. The above and other objects that may become apparent as the description proceeds are obtained by means ot a construction and an arrangement of parts that will be described in detail and reference for this purpose will now be had. to the accompanying drawings in which the preferred embodiment of the invention has been illustrated and in which:

Fig. 1 is a section taken on line 11, Fig. 41, and shows a plan View of the top off the table;

Fig.2 is a detail showing aside elevation of a supporting bracket a portion of the bracket being broken away to better disclose the construction;

Fig. 3 is a detail side elevation of a portion of the table showing the means employed for adjusting; the effective area of the classifying slots;

Fig. 4 is a vertical transverse sectiontaken on line 4l-l-, Fig. 1;

Fig. 5 is a longitudinal vertical section of the table;

Fig. 6 is a section taken on line 6-43, Fig. 5;;a-nd

i Fig. 7 is a transverse section through the table, taken. on line 'Z 'l'.

My improved concentrating device comk prises a supporting frame which may be constructed in any approved ma'nl'ier, but which has been shown as provided at each corner with two parallel vertical posts 1, 1 and at the center of each side with similar A vertical posts 2, 2. The corner posts are connected at their tops and bottoms, respectively by means of transverse bars 3 and 4-, respectively, while the center posts 2, 2 are similarly connected at the top and bottom by transverse bars and 6. Side pieces so 7 and 8 join, respectively the tops -and the bottoms of the end posts 1, 1 and the center posts 2, 2.

Secured to the rearino'st and the foremost corner post 1 is a steel bar 9 ,Whose ends 1O are bent at right angles and project 'outwardly. The outwardly bent lugs 10 are perforated for the reception ofa threaded bolt 11 that has a head 12 and a nut 13.

A i -shaped bracket B has a straight side 14 and a side comprising two angularly related sections 15 and 16. The extreme end of side let and end 16 are perforated for the reception ot'the bolt 11 and these ends rest on the nuts 17 by means of which the bracket can be adjusted vertically. Side 14 is pro- VldGCl Wltll a plurality of spaced openings 1.8 for the reception out an eye bolt 19 to the eye of which a chain 20 is connected. Supported by the chains 20 is a rectangular concentrating table having longitudlnal sides 21 and an end member 22. Extending along the lower inside edge of sides 21 are strips 23 which serve to'str'engthen the side members and to support the outer edge of the two sections C and D of the table. Transverse bars 24 connect the lower edges of the sides 21. These bars are provided centrally with a notch 25 and are reenforced by means of a .bar 26. The table sections C and D are preferably formed from matched flooring laid diagonally and connected by transverse frame members 27 I The sections are also provided with a reen'forcing strip 28 .along their adjacent edges. A strip 29 extends lengthwise of the board between the two sectionsof the table. Secured to the underside of thestrip 29-are short pieces 30 of flatsteel, the ends of which serve as supports for the strips 28 (Fig. 7 A rectangular bar 31 liesrin the notches 25 and serves asa support for the transverse bars 30. The bar 31 "is provided with wedge shaped cams 32 that are spaced apart the same distance as the transverse bars 24 and which'may be moved into the notches 25 by sliding the bar 31 towards the right (Fig. 5). The upper end of bar 31 is provided with an opening 33 (Fig. 6) for the reception of one end of the adjusting bolt 34 which cooperates with a nut 35 held in a recess in the end of bar 31 by means of a strap 36. Bolt 34 passes through an opening in board 22 and has an enlarged head 37 through which a pin 38 extends. It is evident that by rotating bolt 34 so as to move the bar 31 towards the right the wedges will raise the bar 31 and increase the convexity of the table.

The two sections C and D are connected by means of a strip of leather 39, or any other flexible material, and the entire top of the table is covered by a sheet of rubber 40 which is cemented to the upper surface of the table. A number of thin ribs 41 are secured to the upper surface of each section. These ribs have been shown as lying at an angle of forty-five degrees with respect to the center line ofthe table and'terminate directly over the inner edge of each section so as to provide an open space 42 directly over the strip 29. Some of these ribs are out awaysoas to form triangular shaped areas Eat spaced intervals. These open spaces cause the wet pulpto produce eddies that assistin producing an. improved concentration. Applicant desires to direct particular attention to these open spaces as they have been found to produce greatly improved results. The lower endof the table has no transverse wall that corresponds to wall 22, but is open in the center and is provided with short sections of wall 43 that extend inwardly from each cornerin the manner shown most clearly in Fig. 7.

The table is suspended by means of the four chains 20 in the manner shown in Fig. 4. 'Itwill be observed that the chains 20 are upwardly and outwardly inclined.

\Vhen the table is reciprocated from side to side the leading side will move on a downward arc and the following side on an upward arc; this gives a rocking motion which, when combined with the upwardly convex table produces a much better classifying action than can be obtained if the same transverse rocking motion used with av flat table or where an upwardly convex table is reciprocated in a plane.

In Fig. 7 I have shown the upper surface of the table slightly concave along the outer edges; this holds the flow from crowding the sides and permits wider classifying openings to be employed.

The sides 21 are provided with several elongated openings or slots 44 whose lower sides are on the level with the upper surface of the ribs. These slots are spaced longitudinally and serve to permit the lighter portions of the gangue to escape into the side troughs 4:") v. rich convey them away to a suitable dump. In order to be in position to adjust the area oi openings -l-i l have provided two movable plates 46 for each opening. These plates are each provided with transverse slots 47 through which the clamping bolts extend. By moving one or more of these plates, the area of the classifying openings can. be altered as desired. By means of these classifying openings the capacity of the table can be greater increased without sacrificing any of the elliciency as they permit the lightest of the gangue to escape.

For the purpose of reciprocating the tale. I have provided a shaft 48 that is journailed in sp ced bearings 49. his shaft is provided with a pulley 50 to which power may be transmitted by means of a belt (not shown). Each end of the shaft has an cecentric 51 to which one end of a connecting rod 52 is connected. The other ends of the... connecting rods are secured to the ends ol a bar 53 that slides on the spaced parallel rods 54. Rods 54 extend between and connect the ends of fiat bars 55 that in turn are connected to the vertical ends of the bracliets 56. Four springs 57 are slidably mounted on the rods 54, two on each rod; these springs are under compression and tend to holdv the bar 53 at the middle point between bars hen shaft 48 rotates the eccentrics will cause the central bar to be reciprocated and this in turn will lLL'lPlOt'iliQ, the table transversely, which, owing to the pres ence ofthe springs 57 will have a greater amplitude of vibration than the eccentricity of the eccentrics. he spaced eccentr cs tend to steady the table when unequal loading shifts the center of inertia from underneath the transverse bar The eccentrics are so constructed that they can be adjusted If it is found necessary or desirable the bar fiil 5=3ican be connected with the trameyby means of rods .59.

.lln apron (shown dotted) is provided underneath the discharge end of the table and held stationary. rill of the :material that leaves the end of the table will fall upon this apron. The heavy concentrates will fell upon the apron at its middle point and the lighter material. 'larther to the sides. I have provided the apron with u nvardly extending partitions (51 which divides its length into five equal sections a, 1 and a, there being two marked g and two marked .2. The heaviest material is deposited on section an and the lighter on the other sections. The greater the angle of longitudinal inclination, the greater must be the con vexity and therefore the two must be adjusted together in order to get the best re sults.

The diagonal riilles tend to cause all of the material to travel toward the center and the transverse reciprocation and rocking causes all of the heavy values to settle to the bottom. The lighter material washes downwardly across the diagonal ribs and part of the gangue escapes through the side openings, thereby permitting a greater amount of material to be treated. in a given time.

The convexity of the table keeps the material at a uniform depth when it is properly adjusted for the longitudinal inclination because by this means the inclination of ribs 41-1 can be adjusted. The concave portions along the sides prevent the material from crowding the sides and assure that only the lightest of the gangue escapes through the side openings. The transverse rocking gives the table the best possible motion to etliect the concentration desired and produces a greater tendency for the n'iaterial to move transversely than if the table reciprocated in a plane. The fact that the table carries a heavy layer of. material keeps the sylvanite and flour gold submerged at all times and prevents flotation.

Having described my invention, 'what I claim as new is:

l. A concentrating device comprising an elongated, substantially rectangular table having its central portion formed from two rectangular sections whose adjacent edges are secured together by means of a strip of flexible material, means for supporting the adjacent edges, said supporting means being movable so as to vary the position of the adjacent edges of the table, a plurality 01": parallel ribs extending diagonally across the upper surface of each section, said ribs comprising two groups oppositely inclined, means for reciprocating the table transversely and means for permitting materials to escape over the sides during opei on.

2. A. concentrating device comprising, in

combination, an elongated concentrating table whose upper surface is transversely convex, one end of said table being higher than the other, the up per surface being provi.,..ed with diagonal ribs extending inwardly from the sides and downwardly, said ribs l61.'l1 1ll1ll1lll. adjacent the center line oil? the table, means for imparting a transverse reciprocating motion to the table and means for causing the leading side of the table to move along a downwardly inclined arc and the 'lfollowing side to move along an upwardly inclined are during each reciprocation.

3. A concentrating device comprising, in con'ibination, an elongated concentrating table whose upper surface is transversely convex, one end of said table being higher than the other, the upper surface being provided with diagonal ribs extending inwardly from the sides and downwardly, said ribs terminating adjacent the center line of the table, means for imparting a bITLHSVQISGl'G- ciprocating motion to the table, means for adjusting the convexity of the table, and means for causing the leading side oi the table to move along a downwardly inclined arc and the following side to move along an upwardly inclined arc during each reciprocation.

4. A concentrating device for mineral ores, comprising, in combination, a supporting frame, a plurality of supporting members having their upper ends pivotally connected with the :lrame, a table having a transversely convex upper surface, the sides of the table being pivotally connected with the lower ends of the supporting members, the distance, in a direction transverse of the table, between the upper ends of the sup porting members being greater than the corresponding distance between their lower ends whereby when the table is reciprocated in a direction transverse to its length, the leading side will move along a downwardly inclined arc and the following side along an upwardly inclined arc, one end of said table being higher than the other end, each of the two inclined sides of the table being provided with diagonal ribs that extend downwardly and inwardly, terminating adjacent the center of the table and means for imparting to the table a transverse reciproeating motion.

5. A concentrating device for the classification of minerals. comprising, in combination, a supporting framework having spaced pairs of vertical side members, a bracket secured to the inside of each side member, said brackets forming opposed pairs, supporting devices having their upper ends secured to each bracket, a table of less width than the d ance between the points where the supporting members are connected with the opposed pairs of brackets. means of attaching the lower ends of said supporting llll llli

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members to the sides of the tab1e,'the distance between-the lower ends of each pair of supporting members being less than the distance between their upper ends, said table having one end higher than the other and having its upper surface transversely c0nvex, diagonal ribs secured to the upper surface of the table, said ribs extending from the sides of the table downwardly and inwardly and means for imparting a transverse reciprocating motion to the table.

In testimony whereof I affix my signature.

MERLE M. NEWTON. 

